Lens · prime
Pentax Rear Converter 1.4X (6x7/67)
Pentax
Discontinuedmedium-format
The Pentax Rear Converter 1.4X increases focal length by 1.4x at the cost of 1 stop. It was designed for 165mm to 400mm lenses; it cannot be used with the leaf-shutter lenses and vignettes with the 75mm Shift and with 500mm and longer lenses. Pentax Rear Converter 1.4X (6x7/67): 5 elements in 3 groups, 520g.
- Focal length
- 1.4x
- Max aperture
- 1 stop
- Mount
- Pentax 67
- Format
- medium-format
- Elements / groups
- 5 / 3
Known for
- General photography
Considerations
- Only 1.4x focal length increase
Optical characteristics
Silverlog's editorial rating: our own judgement, not measured data.
Sharpness (wide)4, level 4 of 5
Sharpness (stopped)5, level 5 of 5
Contrast5, level 5 of 5
Flare resistance4, level 4 of 5
CA control4, level 4 of 5
Vignetting control4, level 4 of 5
Distortion control4, level 4 of 5
Bokeh: As per main lens
Rendering: Minimal quality loss
Colour: Neutral
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- Very reliable
Buying guide
Better quality than 2x.
Specifications
| Mount | Pentax 67 |
| Focal Length | 1.4x |
| Max Aperture | 1 stop |
| Min Aperture | N/A |
| Weight | 520g |
Optical design
| Formula | other |
| Elements | 5 |
| Groups | 3 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price (US market)
- $200 - $350
- Mint
- ~$450
Indicative, no dated source.